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J. BAIRD. l FEED WATER HEATER POR STEAM BOILERS.

Patented Sept. 29, 1891.

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J. BAIRD. FEED WATER HEATER POR STEAM BOILERS. No. 460,347. Patente-d sept. 2Q. 1891.

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(No Model.) 3 Sheets-Sheet 3.

J. BAIRD. FEED WATERYHEATER FOR STEAM BOILBRS.

No. 460,347. 'Patented Sept. 29, 1891.

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PATENT OFFICE.

.TOI-IN BAIRD, OF NEW YORK, N. Y.

FEED-WATER HEATER FOR ST-EAM-BOILERS.

SPECIFICATION forming part of Letters Patent N o. 460,347, dated September 29, 1.891.

Application filed March 12, 1891. Serial No. 384,736. (No model.)

To a/ZZ whom t 1v1/dy concern.-

Be it known that I, JOHN BAIRD, mechanical engineer, a citizen of the United States, residing at No. 324 Lexington avenue, in the city, county, and State of New York, have invented certain new and useful Improvements in Feed-Tater Heaters for Steam-Boilers, of which the following is a specification.

My invention more especially relates to steam-boilers of the class having horizontal orslightly-inclined iiues. Its object is to secure a compact and efficient boiler adapted to inake ample steam of high pressure in a comparatively small space, which end I attain, principally, by causing the feed-water to traverse externally and longitudinally around the boiler-shell and through the back connection or uptake and smoke-box, where it is thoroughly heated by the escaping products of combustion. The subject-matter claimed is hereinafter specified.

The accompanying drawings show. my improvements as adapted to alocomotive-boiler of the type exemplitiedin United States Letters PatentNo.434,973, granted to me August 26, 1890, illustrating, however, so much only of the apparatus as is necessary to show the subject-matter claimed.

Unless otherwise indicated, the parts are of ordinary construction and operation.

Figure l is a plan; Fig. 2, a vertical longitudinal central section on the line 2 2; Fig. 3, a front elevation; Fig. 4., aback elevation; Fig. 5, a vertical transverse section on lines 5 5 and 5 5 of Fig. 3, and Fig. (i a detail View on the line 6 6 of Fig; 2.

That end of the boiler at which the furnace is situated I call the front7 end, and the opposite the back or rean That side on the left of a person facing the boiler I call the left, and the opposite side the right.7

Soft unfeathereddarts indicate the directions in which the sections are shown. Solid feathered arrows show the course of the products of combustion, and dotted ones that of the feed-water.

A (ire-box A is shown as connected by a back head I with a front tube-sheet of lower shell B, through the fire-tubes b of which the products of combustion pass into the back connection or uptake A. The front head D is composed of two parallel plates, constituting a water-space, with which various pipes are connected, as hereinafter described, and is provided with the usual fire-doors d'. The sides and top of the fire-box consist of a series of transverse arched water-tubes c, placed close together side by side between the front and back heads, being united at each end to longitudinal side tubes E, connecting the front head and lower shell.

A series of longitudinal water-tubes F, connected at their upper ends with the front head, extend. backward and downward near the bottom of the tire-box .in front of the iiretubes of the main shell, with which they are connected by suitable pipes. The fire-box is wider than the main boiler-shell, and a portion of the space thus gained is occupied by water-tubes connecting the front and back heads, these tubes being preferably connected with the inner sheet of the front head and passing through packed watertight sleeves in the back head, with which they are connected by small tubes h.

An upper shell K is shown as extending over the lire-box and lower shell. It is connected with the front head by pipes CZ for the passage of mingled steam and water, with the transverse arched tubes e by small pipes e', and with t-he lower shell by tubes 7s. It is also provided with return-fines 7c k2 and the steam-pipe L, extending through its front head. The water-level is normally below the central tubes 7a2, so that the lower iiues heat the water, while the upper ones dry or superheat the steam. A casing Aincloses and covers the uptake and shells, leaving a space A3 on each side of the upper shell constituting a smoke-box, which connects at the front end of the boiler with the usual smoke-stack or chimney. (Not shown.) Consequently one portion of the hot gases passes through the smoke -box, while another port-ion passes through the returntlues, thereby heating both sides of the boiler-shell K, and thus tending further to dry and superheat the steam therein.

Feed-water flows into a box M on each side of the smoke-box above the fire-box and lower shell through a pipe m, provided with a check valve m. Horizontal pipes M extend through the smoke-box and connect the boxes M with similar ones M2 at the back of the casing A5 behind the back connection, in which boxes the water rises to a series of corresponding return-pipes M3, through which it passes forward to a channel M, extending over the smoke- 5 box and connected by pipes M5 with an upper channel N, extending across the upper part of the back connection or uptake. From thence it descends through a row of small pipes n to a portion of the bottom of the uptake, whence 1o it rises through similar inclosin0i i es n' to a lower channel N', just below the upper one, whence i't passes downward througha pipe N2, provided with a check-valve n2, to a water-inlet pipe N3, crossing the back connection or uptake and connected with the main shell.

rlhe channels, the pendent feed-pipe, the inlet-pipe, and therear end of all the longitudinal water-tubes occupy the back connection or uptake, where they ar-e exposed to the 2o heat passing therethrough, which circulates 5 steam, water, and air passages for filling and working the boiler.

The operation of the apparatus'will readily be understood from the foregoing description.

I do not broadly claim herein the combination of pendent feed-water-heating tubes and longitudinal feed-water tubes, such subjectmatter being claimed in a prior application heretofore filed by me, Serial No. 383,854, iled March 5, 1891, patented July 28, 1891, as No. 456,712.

What l claim as new and as of my own invention is.-

1. The combination, substantially as hereinbefore set forth, of the fire-box, the lower shell in rear thereof, the upper shell overlying both the fire-box and lower shell, the fir-etubes of the upper and lower shells, the uptake connecting them, the smoke-box inciosing the upper shell, the chimney at the front end thereof, water-boxes at both ends of the smoke-box, pipes connecting them, through which the water flows from front tc back and forward again through the side pipes and backward through the central pipes, the upper channel in the uptake with which these central pipes connect, concentric tubes pendent therefrom, a lower channel to which the water flows through these pipes from the upper channel, and the feed-water-inlet pipe passing through the uptake to the boiler.

2'.' The combination, substantially as hereinbefore set forth, of the fire-box, the lower shell in rear thereof, the narrower upper shell overlying both the tire-box and lower shell, the fire-tubes of the upper and lower shells, the uptake connecting them, the smoke-box connecting the uptake and chimney and inclosing the upper shell, water-boxes in the uptake and chimney at each end ofthe smokebox, the low-er and upper side pipes M M5, the front channel M4, the back upper channel, the upper central pipes M5, connecting these fron-t and back channels, the lower back channel, the concentric pipes connecting the back channels and pendent therefrom in the back connection, and the inlet-pipe connecting the back channels and boiler.

3. The combination, substantially as hereinbefore set forth, of the upper shell, its firetubes, the back connection, the front hood or chimney, the smoke-box inciosing the shell,

' the vertical water-boxes in the front hood and back connection, the upperand lower series of side pipes M M3 connecting them, the front channel M4, the back upper channel N, the pipes M5, connecting these front and back channels, the lower back channel, their concentric pendent connecting-pipes in the back connection, and the inlet-pipe passing through the back connection and connecting the lower back channel with the boiler.

et. The heating apparatus hereinbefore described, consisting of the combination of water-boxes at both sides and both ends of the boiler, longitudinal pipes connecting them extending through the smoke-box, through which pipes the water flows from front to back, upward and forward again through the side pipes, and backward through the central pipes, concentric pipes pendent from waterboxes crossing the uptake, and the feed-wateieinlet pipe passing therethrough to the boiler.

In testimony whereof I have hereunto subscribed my name.

JOHN BAIRD. Witnesses:

W. D. BAIRD, ADDISON W. BApIRD.

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